Acute Lymphoblastic Leukemia in Pregnant Ovarian Hypersensitivity Syndrome.

ABSTRACT: Ovarian hyperstimulation syndrome (OHSS) is characterized by cystic enlargement of the ovaries and a fluid retention. This syndrome is sometimes caused after in vitro fertilization. We treated a 37-year-old woman with OHSS after in vitro fertilization, coincidentally complicated with acute lymphoblastic leukemia. Her clinical course of acute lymphoblastic leukemia was aggressive with the manifestation of OHSS, such as massive pleural effusion and massive ascites. The leukemic cells broadly infiltrated to the peritoneum, ovary, central spine fluid, and pleura. We speculated that this hyperpermeability of leukemic cells could be associated with the cytokine milieu caused by OHSS.

Ovarian Hyperstimulation syndrome combined with hypothyroidism: a comprehensive review.

Ovarian Hyperstimulation Syndrome (OHSS) is a systemic condition marked by the enlargement of the ovaries and heightened vascular permeability. And hypothyroidism (HT) emerges as a potential risk factor for OHSS occurrence. This review presented a comprehensive summary of pertinent case reports involving patients diagnosed with both HT and OHSS. Detailed exploration was conducted into their clinical presentations, diagnostic methodologies, and treatment modalities. Additionally, the review delved into potential interaction mechanisms between HT and OHSS, encompassing various aspects including hormone levels. Moreover, management strategies for mitigating the risk of OHSS in HT patients were thoroughly reviewed and the importance of monitoring thyroid function in those experiencing OHSS was emphasized. This review indicated that the association between HT and OHSS, underscoring its multifaceted complexity. It could accentuate the ongoing necessity for rigorous research and clinical refinement to deepen our comprehension of this association and to bolster diagnostic and therapeutic methodologies for optimal patient care. In conclusion, this review offered valuable insights for future research directions and clinical practices for patients afflicted with OHSS and HT.

First case report of serous otitis media as a complication of severe ovarian hyperstimulation syndrome: Case report and literature review.

Ovarian hyperstimulation syndrome (OHSS) may be a severe complication of controlled ovarian hyperstimulation during assisted reproductive technology. During OHSS, fluid shifts from the intravascular space to the third-space compartments as the result of an increase in capillary permeability. This can cause fluid accumulation in peritoneal as well as thoracic cavities. The patient presented with symptoms of severe OHSS (bilateral hydrothorax and pulmonary effusion), requiring bilateral ultrasound-guided paracentesis and bilateral thoracentesis during her Emergency Room visits and hospitalization. Due to distant effects from the increased capillary permeability, the patient presented fluid in the middle ear, which led to the development of serous otitis media 12 days after egg retrieval. This was resolved 2-3 weeks later after being treated with antihistamines and antibiotics given by her Ear, Nose, and Throat doctor. OHSS risk may be reduced by continuous monitoring of patients undergoing ovulation induction, using an appropriate gonadotropin dosage, and using additional agents known to decrease its risk. If OHSS still occurs, symptomatic treatment and a multidisciplinary team of professionals may be needed to prevent fluid build-up complications. In contrast to many published articles about OHSS and its complications, this is the first case report of a patient presenting serous otitis media as a complication of severe OHSS.

Assisted Reproductive Technology in the Presence of Polycystic Ovary Syndrome: Current Evidence and Knowledge Gaps.

OBJECTIVE: In this narrative review, we discuss the current evidence as well as the knowledge gaps concerning assisted reproductive technology (ART) indications, protocols, and results in the presence of polycystic ovary syndrome (PCOS). METHODS: An electronic literature search was performed for English-language publications in the last decade in databases such as PubMed, Medline, the Web of Sciences, Embase, and Scopus. RESULTS: We found evidence that ovarian steroidogenesis and folliculogenesis are deeply altered by PCOS; however, the oocyte quality and pregnancy rates after ART are not affected. Patients with PCOS are more sensitive to the action of exogenous gonadotropins and more likely to develop ovarian hyperstimulation syndrome. This risk can be mitigated by the adoption of the gonadotropin-releasing hormone antagonist protocols for pituitary blockade and ovarian stimulation, along with frozen embryo transfer, without compromising the odds of achieving a live birth. Pregnancy complications, such as miscarriage, gestational diabetes, preeclampsia, and very preterm birth, are more frequent in the presence of PCOS, requiring more intense prenatal care. It remains uncertain whether weight reduction or insulin sensitizers used before ART are beneficial for the treatment outcomes. CONCLUSION: Although PCOS is not a drawback for ART treatments, the patients need special care to avoid complications. More in-depth studies are needed to uncover the mechanisms of follicular growth, gamete maturation, and endometrial differentiation during ART procedures in the presence of PCOS.

Cocktail treatment by GnRH-antagonist, letrozole, and mifepristone for the prevention of ovarian hyperstimulation syndrome: a prospective randomized trial.

OBJECTIVE: This study is aimed to determine the efficacy of a cocktail style treatment by combining GnRH-antagonist, letrozole, and mifepristone on the prevention of ovarian hyperstimulation syndrome (OHSS) in high-risk women. METHODS: This prospective, randomized controlled clinical trial was performed between January 2018 and December 2018. A total of 170 women who identified as high risk of OHSS during the ovarian hyperstimulation and underwent cryopreservation of whole embryos. On the day of oocyte retrieval, the combination group received 0.25 mg Cetrorelix for 3 d, 5 mg letrozole for 5 d, and 50 mg mifepristone for 3 d, the mifepristone group received 50 mg mifepristone for 3 d. A total of 156 cases were included in final analysis. All the frozen embryo transfer (FET) cycles were followed up until December 2021. RESULTS: The combination group showed significantly decreased incidence of moderate and severe OHSS than mifepristone group (20.5% vs. 42.3%), with remarkably reduced serum estradiol level on hCG + 3 and + 5 d, decreased ovarian diameter, and shortened luteal phase. Oocyte retrieval number, levels of estradiol on hCG + 0 and VEGF, and ovarian diameter on hCG + 5 were associated with the severity of the symptoms. There was no significant difference in cumulative live birth rates (LBRs) between the combination and mifepristone group (74.4% vs. 76.9%). CONCLUSIONS: The combination treatment effectively reduces the incidence of moderate/severe OHSS in high-risk women.

Ovarian hyperstimulation syndrome with carotid artery dissection and cerebral infarction: a case report.

BACKGROUND AND PURPOSE: Ovarian hyperstimulation syndrome (OHSS) is one of the most serious iatrogenic complications in assisted reproductive technology, which seem rarely associated with cerebrovascular diseases. We reported a patient diagnosed with OHSS combined with carotid artery dissection and massive cerebral infarction. CASE PRESENTATION: We reported a unique case of a 31-year-old woman who experienced abdominal pain, blurred consciousness, and speech inability after 15-day continuous injection of human gonadotropin for infertility. Imaging examination showed hyperacute cerebral infarction in the left frontotemporal island parietal lobe and left internal carotid artery dissection. After therapeutic use of low-molecular-weight heparin calcium anticoagulation and other conventional cerebrovascular treatments, she eventually achieved a good prognosis. CONCLUSIONS: OHSS seemd rarely associated with cerebrovascular diseases, such as infarction and carotid artery dissection. Encountering abdominal symptoms combined with neurologic symptoms, a detailed history and a thorough examination are essential. It is necessary to comprehensively analyze the pathogenesis and formulate individualized therapy according to the specific conditions of patients.

Synchronous bilateral ovarian torsion followed by recurrent unilateral torsion in a patient undergoing fertility treatment: A case report and literature review.

BACKGROUND: Ovarian torsion (OT) is a gynaecological emergency and requires prompt recognition and treatment in order to prevent the loss of ovarian function. Patients who are undergoing fertility treatment are at an increased risk of developing OT. OBJECTIVE: The diagnosis of OT in patients undergoing fertility treatment can be challenging as they often present with abdominal pain and other non-specific symptoms. We highlight the importance of early diagnosis of suspected torsion and performed a literature review on cases of bilateral OT to review its presentation, investigation, and subsequent management. CASE REPORT: A 32-year-old nulliparous woman who was undergoing controlled ovarian stimulation presented with lower abdominal pain and was initially managed as ovarian hyperstimulation syndrome (OHSS). Her pain did not subside following conservative management and she proceeded to have a laparoscopy which demonstrated synchronous bilateral ovarian torsion (SBOT), both ovaries were detorted. Eight months later, she was preparing for her frozen embryo transfer (FET) cycle, patient again presented with significant right sided abdominal pain and was found to have a recurrent torsion of the right ovary which was again detorted successfully. CONCLUSIONS: Clinicians should have a low-threshold to investigate and rule out OT in patients who present with lower abdominal pain, especially in those with additional risk factors for torsion. Patients with confirmed torsion can be successfully managed with detorsion of the ovaries. Further research is needed to determine the best management option for patients with recurrent torsion episodes.

A promising treatment for spontaneous ovarian hyperstimulation syndrome due to familial partial lipodystrophy: GnRH analogs combined with cyst aspiration.

PURPOSE: To present a patient with familial partial lipodystrophy (FPLD) and polycystic ovary syndrome (PCOS) who was admitted with spontaneous ovarian hyperstimulation syndrome (OHSS)-like extremely enlarged ovaries, which was successfully treated using gonadotropin-releasing hormone analogs and abdominal cyst aspiration in combination. METHOD: This is a descriptive case report of a single patient with FPLD and PCOS. RESULTS: Clinical improvement was achieved 6 months after therapy besides progressive reduction in total testosterone and DHEAS. Furthermore, there was a significant improvement in hyperinsulinemia and hypertriglyceridemia. Additionally, reduction in the size of ovarian cysts, reduction in the size and number of localizations of acanthosis nigricans, reduction in scores of mFGS, and weight loss were also observed. CONCLUSION: Although there are few reports in the literature describing the association between PCOS with FPLD, management of this novel spontaneous OHSS-like condition has not yet been clearly defined. In the case of extremely enlarged multicystic ovaries and severe hyperandrogenemia, GnRH analogs may be considered to prevent ovarian enlargement and reduce hyperandrogenemia, especially when other treatment options are inappropriate.

A case report of Ovarian hyperstimulation syndrome and corpus luteum rupture in twin pregnancies with IVF-ET.

INTRODUCTION: Ovarian hyperstimulation syndrome (OHSS) is a common complication during assisted conception treatment, mostly seen in patients with ovarian hyperresponsiveness such as polycystic ovary syndrome, especially in post-invitro fertilization and embryo transfer (IVF-ET) pregnancies. Its main symptoms are abdominal distension, abdominal pain, nausea and vomiting with ascites, pleural fluid, leukocytosis, hemoconcentration and hypercoagulation. This disease is a self-limiting disease and can be gradually cured by rehydration, albumin infusion and correction of electrolyte disorders in moderate to severe cases. Luteal rupture is a more common gynecological emergency abdomen. The combination of twin pregnancy, OHSS and ruptured corpus luteum is very rare. We successfully avoided the stimulation of the risk of pregnancy abortion by surgical exploration through dynamic ultrasound monitoring and vital signs observation in the absence of experience in primary care, and the patient hard-won twin pregnancy was successfully treated conservatively. PATIENT CONCERNS: The patient is a 30-year-old post-IVF-ET woman with an established twin pregnancy, OHSS and sudden onset of lower abdominal pain. DIAGNOSIS: Twin pregnancy, OHSS combined with ruptured corpus luteum. INTERVENTIONS: Rehydration, albumin infusion, low molecular heparin for thromboprophylaxis, luteinizing support, ambulatory ultrasound monitoring. OUTCOMES: After more than 10 days of standardized treatment for OHSS, dynamic ultrasound monitoring and close observation of vital signs, the patient was discharged cured of her condition and is continuing her pregnancy. CONCLUSION: Our case shows that the possibility of acute abdominal rupture of the corpus luteum is still present in the case of combined OHSS in pregnancy, and that some patients with corpus luteum rupture can heal spontaneously during close testing to avoid the increased risk of miscarriage with surgical exploration.

Intrahepatic cholestasis of pregnancy after ovarian hyperstimulation syndrome with wild-type ABCB4 gene: a peculiar case and literature review.

BACKGROUND: Intrahepatic cholestasis of pregnancy (ICP) in the first trimester occurring after ovarian hyperstimulation syndrome (OHSS) is a rare condition and few cases are reported in the literature. Hyperestrogenism may explain this problem in genetically predisposed women. The objective of this article is to report one of these rare cases and offer an overview of the other published cases. CASE PRESENTATION: We report a case of severe OHSS followed by ICP in the first trimester. The patient was admitted to the intensive care unit and was treated according to the guidelines for the management of OHSS. Moreover, the patient also received ursodeoxycholic acid for ICP, which brought to an improvement of her clinical conditions. The pregnancy continued without other complications until the 36th week of gestation, when the patient developed ICP in the third trimester and underwent cesarean section for increased bile acid levels and cardiotocographic (CTG) pathologic alterations. The newborn was a healthy baby weighing 2500 gr. We also reviewed other case reports published by other authors about this clinical condition. We present what is, to our knowledge, the first case of ICP developed in the first trimester of pregnancy after OHSS in which genetic polymorphisms of ABCB4 (MDR3) have been investigated. CONCLUSIONS: ICP in the first trimester might be induced by elevated serum estrogen levels after OHSS in genetically predisposed women. In these women, it might be useful to check for genetic polymorphisms to know if they have a predisposition for ICP recurrence in the third trimester of pregnancy.

Gonadotropins as pharmacological agents in assisted reproductive technology and polycystic ovary syndrome.

Polycystic ovary syndrome (PCOS) is a complex endocrinopathy associated with subfertility/infertility and pregnancy complications. Most PCOS women opt for assisted reproductive technologies (ART) for successful conception; however, optimization of the relative doses of the gonadotropins [follicle-stimulating hormone (FSH), luteinizing hormone (LH)/human chorionic gonadotropin (hCG)] for appropriate steroidogenesis, without causing ovarian hyperstimulatory syndrome (OHSS), is challenging. Embryonic factors probably do not contribute to pregnancy loss in PCOS women, albeit hormonal imbalance impairs the metabolic microenvironment critical for oocyte maturation and endometrial receptivity. Certain clinical studies have confirmed the role of metabolic corrections in increasing the rate of pregnancy in PCOS women. This review focuses on the impact of untimely high LHCGR and/or LH levels on oocyte/embryo quality, pregnancy outcomes in ART, and exploring LHCGR as a potential drug target in PCOS women.

Venous Thromboembolism Associated with Assisted Reproductive Technology: A Systematic Review and Meta-analysis.

BACKGROUND: Hormonal exposure leads to an increased risk of venous thromboembolism (VTE) but the risk of VTE associated with assisted reproductive technology (ART) is not clearly determined. METHODS: We searched in PubMed, EMBASE, Web of Science, and the Cochrane Library databases and identified all relevant articles published up to February 1, 2021. The primary objective was to determine the frequency of VTE associated with ART. Secondary objectives were to determine (1) the risk of VTE associated with ART as compared to pregnancy without ART; (2) the risk of VTE associated with ovarian hyperstimulation syndrome (OHSS); and (3) to determine potential risk factors of VTE related to ART. RESULTS: Fourteen studies were included. The overall frequency of VTE associated with ART was 0.23% (95% confidence interval [CI]: 0.07-0.46). Women undergoing ART had a two- to threefold increased risk of VTE as compared to spontaneous pregnancy (relative risk [RR]: 2.66; 95% CI: 1.60-4.43). The overall frequency of VTE specifically related to OHSS was <0.001%. The risk of VTE after ART complicated by OHSS, as compared to ART without OHSS, was higher but not statistically significant (RR: 14.83; 95% CI: 0.86-255.62). Risk factors of VTE associated with ART were in vitro fertilization procedure (RR, odds ratio [OR], and hazard ratio varying from 1.77, 95% CI: 1.41-2.23 to 4.99, 95% CI: 1.24-20.05), hyperhomocysteinemia (OR: 15.2; 95% CI: 2.0-115.0), polycystic ovarian syndrome (PCOS) (RR: 4.8; 95% CI: 1.7-13.4), successful ART leading to pregnancy (OR: 13.94; 95% CI: 1.41-137.45). CONCLUSION: Further large prospective studies on risk factors of VTE in women undergoing ART are needed in order to optimize thromboprophylaxis in this context.

The Association between Ovarian Hyperstimulation Syndrome and Pregnancy Complications following Fertility Treatments.

OBJECTIVE: This study was aimed to assess the association between ovarian hyperstimulation syndrome (OHSS) and pregnancy complications among women who conceived following fertility treatment. STUDY DESIGN: A retrospective population-based cohort study, including all singleton deliveries of patients conceived following ovulation induction (OI) or in vitro fertilization (IVF) between 1988 and 2016, was conducted. All births occurred in a single tertiary medical center. A comparison was performed between deliveries of women who had experienced OHSS at early gestation and subsequently had a pregnancy and women without OHSS. Women lacking prenatal care, multiple gestations, and stillbirths were excluded from the analyses. A multivariable logistic regression model was used to control for confounders. RESULTS: During the study period, 351,373 deliveries met the inclusion criteria, of which 6,748 were deliveries of infants who were conceived by either IVF or OI. Of this study population, 105 cases (1.6%) composed the exposed group, that is, women who had experienced OHSS with a subsequent live birth. In the multivariate analyses, after controlling for confounders, OHSS was not found as an independent risk factor for preeclampsia, gestational diabetes mellitus (GDM), intrauterine growth restriction (IUGR), preterm delivery (both <37 and <34 weeks), low birth weight (LBW), very LBW (VLBW), small for gestational age (SGA), and caesarean delivery. In a subanalysis conducted solely on the IVF population, similar results were found, aside from the association between OHSS and preterm delivery before 34 weeks of gestation which was statistically significant (adjusted odds ratio [AOR] = 2.3 95% confidence interval [CI]: 1.0-5.3, p = 0.049). CONCLUSION: In our population, OHSS was not found as a risk factor for adverse pregnancy and perinatal outcome. In IVF patients, OHSS is a risk factor for preterm delivery before 34 weeks of gestation. KEY POINTS: · OHSS is not a risk factor for pregnancy complications.. · Complications investigated were preeclampsia, GDM, prematurity, and others.. · In IVF patients, OHSS is a risk factor for preterm delivery..

Intrafollicular fluid metabolic abnormalities in relation to ovarian hyperstimulation syndrome: Follicular fluid metabolomics via gas chromatography-mass spectrometry.

INTRODUCTION: Ovarian hyperstimulation syndrome (OHSS) is the most serious iatrogenic complication of ovulation stimulation during assisted reproductive technology. The main objective of this study was to investigate intrafollicular fluid metabolic change profiles of OHSS in non-ovarian etiologic infertility women (CON) and polycystic ovarian syndrome patients (PCOS). METHODS: 87 infertile women were divided into four subgroups: CON-Norm (CON with normal ovarian response), CON-OHSS (CON with OHSS), PCOS-Norm (PCOS with normal ovarian response), and PCOS-OHSS (PCOS with OHSS). The intrafollicular fluid metabolic profiles were analyzed with gas chromatography-mass spectrometry. The multivariable-adjusted conditional logistic regression was applied to assess the association of metabolites with OHSS risk. RESULTS: We identified 17 and 3 metabolites that related to OHSS risk in CON and PCOS, respectively. 13 OHSS risk-related metabolites in CON were unsaturated fatty acids, 8 of which were also the significantly altered metabolites between all PCOS and CON-Norm. CONCLUSION: Our study may shed light on the role of intrafollicular fluid metabolic abnormalities in the pathophysiology of OHSS. The findings suggested that there might be some metabolic heterogeneities underlying the development of OHSS in CON and PCOS women and indicated possible shared etiological factors in the development of PCOS and OHSS.

Ovarian Hyperstimulation Syndrome: A Case Report.

BACKGROUND: Ovarian hyperstimulation syndrome is a rare, life-threatening obstetric emergency. Early recognition and prompt treatment of ovarian hyperstimulation syndrome are essential owing to the risk of long-term complications associated with this condition. CASE PRESENTATION: A 30-year-old female presented to the emergency department with a chief complaint of abdominal pain. After assessment and diagnostic testing, she was diagnosed as having ovarian hyperstimulation syndrome. The patient was admitted for 24-hour observation. The patient was discharged home with instructions to follow up with an outpatient reproductive medicine clinic. One month after her visit to the emergency department, the patient has not had any complications related to the diagnosis. CONCLUSION: This manuscript outlines the case of a patient presenting to the emergency department with ovarian hyperstimulation syndrome that was promptly recognized and treated. It is important for emergency nurses to quickly identify the risk factors and clinical presentation of ovarian hyperstimulation syndrome to decrease the risk of long-term complications.

MULTIPLE ACUTE POSTERIOR CIRCULATION STROKE WITH LESIONS IN THE PONS AND BOTH HEMISPHERES OF THE CEREBELLUM ASSOCIATED WITH OVARIAN HYPERSTIMULATION SYNDROME: A CASE REPORT OF A WHITE EUROPEAN ADULT IN UKRAINE.

We have presented a brief literature overview of the disease, supported by a clinical case of multiple acute posterior circulation strokes with lesions in the pons and both hemispheres of the cerebellum associated with ovarian hyperstimulation syndrome in a white young European adult in Ukraine. Specific features of posterior circulation stroke associated with ovarian hyperstimulation syndrome were determined, analyzed, and described. Complex posterior circulation cerebral infarction in the pons and both hemispheres of the cerebellum associated with ovarian hyperstimulation syndrome has not been reported before but has devastating consequences for both mother and fetus. Strokes in patients with OHSS must be timely prevented, promptly diagnosed, and treated to avoid high morbidity and mortality associated with it.

Ovarian Hyperstimulation Syndrome: A Simulation Case for Emergency Medicine Residents.

Introduction: Ovarian hyperstimulation syndrome (OHSS) is a complication of assisted reproductive technology (ART) for infertility. Given the potential for significant morbidity, it is important for emergency medicine (EM) residents to be able to recognize and initiate treatment for this disorder. Methods: A high-fidelity human patient simulator was used, with availability of bedside ultrasound. PGY 1-4 EM residents participated in this case of a 28-year-old female patient undergoing treatment for infertility who presented to the emergency department with shortness of breath and near syncope. Workup revealed a diagnosis of OHSS. After the simulation, we surveyed residents on their knowledge of OHSS prior to participation in the simulation. We also asked about their confidence in caring for a patient with OHSS pre- and postsimulation based on a 5-point Likert scale. Results: A total of 24 EM residents completed this simulation case. Prior to participating in the simulation experience, 62% of residents reported that they had heard of OHSS, and 17% of residents had previously managed a patient with OHSS. After participating in the simulation, residents' comfort with managing a patient with OHSS increased from 1.7 to 3.7 points (1 = not at all comfortable, 5 = extremely comfortable; p < .001). Discussion: OHSS is a rare but important complication of ART that many EM residents have not treated in the clinical environment. As the presenting symptoms may mimic other diagnoses, obtaining a detailed history and utilizing bedside ultrasonography are essential to diagnosing and correctly treating these patients.

Association between hospital treatment volume and major complications in ovarian hyperstimulation syndrome.

OBJECTIVE: An inverse relationship between hospital volume and adverse patient outcomes has been established for many conditions, but has not yet been examined in ovarian hyperstimulation syndrome (OHSS). Given the rarity of severe OHSS, but potential for high morbidity, this study aimed to elucidate the effect of hospital volume on inpatient OHSS-related complications. METHODS: This is a retrospective observational study querying the National Inpatient Sample, 1/2001-12/2011. Study population was 11,878 patients with OHSS treated at 735 hospitals. Annualized hospital OHSS treatment volume was grouped as: low-volume (1 case/year), mid-volume (>1 but < 3.5 cases/year), and high-volume (≥3.5 cases/year). Main outcome measure was major complication rates stratified by hospital treatment volume, assessed by multinomial regression and binary logistic regression models. RESULTS: A total of 2,415 (20.3%) patients were treated at low-volume centers, 5,023 (42.3%) at mid-volume centers, and 4,440 (37.4%) at high-volume centers. Patients treated at high-volume centers were more likely to be older and less comorbid with higher incomes and lower body mass index (P < 0.05). High-volume hospitals were more likely to be urban-teaching centers with large bed capacity (P < 0.001). Overall, 1,624 (13.7%) patients experienced a major complication during hospitalization. Patients treated at high-volume hospitals had lower rates of major complications (high: 11.0%, mid: 15.2%, low: 15.6%, P < 0.001). On multivariable analysis, treatment at high-volume hospitals was independently associated with a nearly 20% lower rate of major complications (odds ratio 0.82, 95% confidence interval 0.70-0.97, P = 0.021). CONCLUSION: Our study suggests that higher hospital treatment volume for OHSS may be associated with improved outcomes.

Fluidothorax as an atypical symptom of late ovarian hyperstimulation syndrome.

OBJECTIVE: To present a case of isolated fluidothorax as a symptom of atypical late ovarian hyperstimulation syndrome. METHODS: Review of available information and presentation of our case observed at the Department of Obstetrics and Gynaecology, 1st Faculty of Medicine, Charles University and University Hospital Bulovka. GnRH antagonist protocol was used to stimulate the patient and fresh embryo transfer was performed. Sixteenth day after the oocyte retrieval the patient was examined due to dyspnoea and lab exam proved ovarian hyperstimulation syndrome. CONCLUSION: Late ovarian hyperstimulation syndrome can lead to isolated fluidothorax in case of additional favourable conditions.